The most common leveller specification mistake is also the most expensive to fix: choosing insufficient adjustment range. A leveller with 15mm of range specified for a floor with 18mm of variation means the cabinet cannot be leveled. The fix — if it is discovered during installation — is removing the levellers, replacing them with extended-range models, and re-installing. The hardware cost is trivial; the labor cost of rework is not.
This guide explains how to determine the right adjustment range for any installation scenario, based on floor condition, cabinet type, and installation context.
The Range Problem
Why "Enough Range" Is More Than the Measured Variation
Three factors consume adjustment range beyond the measured floor variation:
| Factor | Range Consumed | Why |
| Initial setting margin | 3-5mm | Levellers should NOT be set at minimum or maximum — always start at mid-range to allow adjustment in both directions |
| Measurement error | 2-5mm | Floor survey may miss localised dips or high spots |
| Cabinet structure tolerance | 1-3mm | Cabinet base may not be perfectly flat; slight twist consumes range at individual feet |
| Total hidden consumption | 6-13mm | This is range that is used before addressing measured floor variation |
The Range Formula:
```
Required Range = Measured Floor Variation + Hidden Consumption (6-13mm) + Safety Margin (3-5mm)
```
Example:
- Measured floor variation: 10mm
- Hidden consumption: ~8mm (mid-range setting + measurement tolerance + structure)
- Safety margin: 4mm
- Required range: 10 + 8 + 4 = 22mm minimum
A leveller with 15mm range would fail. A leveller with 25mm range would succeed with margin.
Range Selection by Floor Type
| Floor Condition | Measured Variation | Required Range | Recommended Leveller |
| New screed, professionally leveled | 2-5mm | 12-18mm | Standard (15-20mm) |
| New screed, standard tolerance | 3-8mm | 15-22mm | Standard-plus (20-25mm) |
| Tiled floor, new | 2-8mm | 15-22mm | Standard-plus (20-25mm) |
| Tiled floor, older | 5-15mm | 20-30mm | Extended (25-35mm) |
| Timber suspended floor | 5-20mm | 20-35mm | Extended (30-40mm) |
| Older property, mixed floor surfaces | 10-25mm | 25-40mm | Extended-plus (35-50mm) |
| Heritage/period property | 15-40mm+ | 30-55mm+ | Maximum-range (50mm+) |
| Commercial with drainage slope | 10-30mm | 25-45mm | Extended-plus (35-50mm) |
Range Selection by Cabinet Type
| Cabinet Type | Additional Range Required | Reason |
| Standard base cabinet (4 feet) | Baseline | — |
| Wide base cabinet (6 feet, 900mm+) | +3-5mm | More contact points = more variation to accommodate |
| Tall cabinet/pantry (1,800mm+) | +3-5mm | Height amplifies any out-of-level; more precision needed |
| Island unit (8+ feet) | +5-8mm | Large footprint spans more floor variation |
| Corner cabinet | +3-5mm | Often sits in least-accessible, least-level corner |
| Run of connected cabinets | +3-5mm overall | First cabinet leveled to floor; subsequent to each other |
The Cost of Insufficient Range
What Happens When Range Runs Out
| Scenario | Consequence | Cost to Fix |
| Leveller bottoms out (fully retracted) at a high spot | Cabinet sits high; cannot be lowered to match adjacent units | Replace all levellers with shorter-body type OR grind floor high spot |
| Leveller tops out (fully extended) at a low spot | Foot loses contact with floor; cabinet rocks on other feet | Replace with extended-range levellers; re-install |
| Range is just sufficient but no margin | Cabinet can be leveled but any future floor movement (settlement, thermal) will un-level it | Accept risk or replace preemptively |
| Installer compensates with shims | Cabinet is leveled but shims can shift, compress, or rot over time | Re-leveling service call |
The $5 Lesson:
An extended-range leveller costs $0.30-1.00 more than the standard-range version. The labor cost of replacing incorrectly specified levellers during installation is $50-150 in wasted time. The extended-range version is always the cheaper option.
When Extended Range Is Worth the Premium
| Scenario | Standard Range Sufficient? | Recommendation |
| New-build apartment, screeded floors | ✅ Yes (20mm) | Standard range acceptable |
| Kitchen renovation in 10-20 year old property | ⚠️ Maybe | Extended range (30mm+) recommended |
| Any property older than 30 years | ❌ No | Extended range (35mm+) minimum |
| Commercial installation | ❌ No | Extended range (35mm+) standard |
| High-end residential (callback-averse) | ⚠️ Risk | Extended range for peace of mind |
| Unknown floor condition (can't survey before specifying) | ❌ No | Extended range (40mm+) for safety |
| Bathroom (tiled floor, potential water damage below) | ⚠️ Maybe | Extended range recommended |
| Basement installation | ❌ No | Maximum range (50mm+); basements have the worst floors |
The default rule: If you cannot survey the floor before specifying levellers, choose extended range (30mm+). The $0.30-1.00 premium per leveller is the cheapest insurance in cabinet hardware.
Standard Range Options
What's Available
| Range Category | Typical Stem Travel | Stem Diameter | Load Rating |
| Compact | 10-15mm | M6 or M8 | 40-60kg |
| Standard | 15-25mm | M8 | 60-100kg |
| Extended | 25-40mm | M8 or M10 | 80-120kg |
| Maximum | 40-55mm | M10 or M12 | 100-180kg |
Within each category, choose the specific range based on the formula above — never specify the minimum that should work. Always have margin.
Quick Selection Guide
If the answer is "I don't know the floor condition": specify 35mm+ range. It will always be enough for any normal residential or light commercial installation.
Conclusion
Leveller adjustment range is not the place to save pennies. The difference between 15mm and 30mm of range is typically $0.30-1.00 per leveller — a trivial amount compared to the labor cost of discovering insufficient range during installation. When in doubt, specify extended range. A leveller with too much range works perfectly (you simply don't use the full range); a leveller with too little range does not work at all.
Key takeaways:
At Shaxi Hardware, we manufacture adjustable levellers in all standard range categories — from compact 10-15mm to maximum 50mm+ — across all material grades. Our technical team provides range selection guidance based on your specific installation conditions.
Request leveller range recommendation for your project
Additional Resources
- [Link to: /collections/adjustable-connecting-leveller – Complete Leveller Range]
- [Link to: /collections/connecting-fittings – Connecting Fittings]
- [Link to: /collections/shelf-support – Shelf Supports]
- [Link to: /pages/contact – Range Selection Support]
- [Link to: /pages/about-us – ISO 9001 Manufacturing]
About Shaxi Hardware
With over 15 years of experience manufacturing furniture hardware, Shaxi Hardware serves brands and manufacturers across 40+ countries. Our ISO 9001 certified production facility manufactures adjustable levellers with stem travels from 10mm to 55mm, load ratings from 40kg to 180kg, across zinc alloy, powder-coated steel, and stainless steel. All products supplied with documented adjustment specifications and range selection guidance.
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